| First Order Performance Limited | Professional & scientific | 2024 |
| First Pour Ltd | Professional & scientific | 2019 |
| First Press Retail Ltd | Wholesale & retail | 2018 |
| First Sight Scans Limited | Health & social care | 2023 |
| First Steps (Bath) | Health & social care | 1991 |
| Firth & Blakemore Carpenters Ltd | Construction | 2014 |
| Firtops Management Company Limited | Construction | 2014 |
| Fit 4 Life Osteopathy Limited | Health & social care | 2014 |
| Fit for Leadership Limited | Professional & scientific | 2012 |
| Fitmom Ltd | Arts & recreation | 2025 |
| Fitzroy Hawk Ltd. | Information & communication | 2011 |
| Fitzroy House Management Limited | Households | 2017 |
| Five Alfred Street Ltd | Households | 2025 |
| Five Brown Bears Ltd | Financial services | 2022 |
| Five Day Film School Limited | Information & communication | 2019 |
| Five Knights Limited | Professional & scientific | 2011 |
| Five Melons Limited | Arts & recreation | 2022 |
| Fivemews Limited | Real estate | 1984 |
| Flame Futures and Careers Limited | Administrative & support | 2025 |
| Flan O'Briens Limited | Hospitality | 2013 |
| Flare Digital Ltd | Information & communication | 2024 |
| Flash Forward Logistics Ltd | Transport & logistics | 2026 |
| Flavouring Resources Limited | Extraterritorial | 1989 |
| Flemington Accounts Limited | Professional & scientific | 2020 |
| Flexible Barrier Films Ltd. | Manufacturing | 2012 |
| Flint Goods Ltd | Wholesale & retail | 2025 |
| Flip OR Stick Assets Limited | Real estate | 2026 |
| Float New Media Design Limited | Administrative & support | 2005 |
| Florence Abendanon Jewellery Ltd | Manufacturing | 2018 |
| Floresco Media Ltd | Professional & scientific | 2024 |
| Flotec OIL & Fuel Systems Limited | Wholesale & retail | 1961 |
| Flourish CSR Limited | Professional & scientific | 2019 |
| Flourish Zone Ltd | Information & communication | 2003 |
| Flourishing Minds Limited | Education | 2023 |
| Flow Bar Frome Ltd | Hospitality | 2020 |
| Flowco Limited | Construction | 1994 |
| Flower Associates Limited | Information & communication | 2000 |
| Flower Property Investments Ltd | Real estate | 2025 |
| Flowers of Bath Ltd | Wholesale & retail | 2018 |
| Flowline Installation Ltd | Construction | 2011 |
| Flowr Sourdough Limited | Manufacturing | 2026 |
| Floyd Consulting Limited | Real estate | 2015 |
| Flue Centers Limited | Extraterritorial | 1995 |
| Fluidpower (Stainless Steel) Limited | Extraterritorial | 1985 |
| FLY Fitness Limited | Arts & recreation | 2017 |
| FLY Safely Services Limited | Professional & scientific | 2021 |
| Flying Mountain Limited | Information & communication | 2025 |
| Flying Saucer Coffee Company Ltd | Hospitality | 2023 |
| Flying Stag Ltd | Wholesale & retail | 2019 |
| FM Stunts Media Limited | Professional & scientific | 2024 |
| Fnyr Limited | Professional & scientific | 2026 |
| Focus Counselling (UK) Ltd | Health & social care | 2003 |
| Focuszen Labs Ltd | Information & communication | 2025 |
| Foggworth Ltd | Real estate | 2018 |
| Fold Consulting Engineers Limited | Professional & scientific | 2018 |
| Fone Daddy Ltd | Wholesale & retail | 2026 |
| Fonesolutions ( South West ) Limited | Wholesale & retail | 2007 |
| Foo's Ltd | Real estate | 2013 |
| Food Amore Ltd | Hospitality | 2024 |
| Food Development Property Ltd | Real estate | 2023 |
| Food Nation Entertainment Limited | Professional & scientific | 2025 |
| Food Procurement Consulting Limited | Professional & scientific | 2020 |
| Foodbev Media Ltd | Information & communication | 1993 |
| Forbes Heating and Plumbing Ltd | Construction | 2020 |
| Forbes Plumbing & Heating Ltd | Construction | 2005 |
| Forceteck Ltd | Information & communication | 2023 |
| Ford RE Consulting Ltd | Real estate | 2025 |
| Fordham Estate Agents Limited | Real estate | 2024 |
| Fordhams Estate Agents Limited | Real estate | 2024 |
| Forecast Creative Limited | Professional & scientific | 2014 |
| Forefield Place Management Company Limited | Households | 1981 |
| Foresight Accounting Limited | Professional & scientific | 2025 |
| Forest Days Ltd | Education | 2024 |
| Forever Carers Limited | Administrative & support | 2022 |
| Forever Learn Limited | Administrative & support | 2017 |
| Forge House Technology Services Ltd | Professional & scientific | 2021 |
| Forget ME NOT Familiar Friends CIC | Health & social care | 2023 |
| Form Talent Ltd | Administrative & support | 2018 |
| Formac Electronics Limited | Information & communication | 1981 |
| Format Engineers Ltd | Professional & scientific | 2014 |
| Formby Forensic Services Limited | Administrative & support | 2016 |
| Forte Nutrition Ltd | Wholesale & retail | 2026 |
| Fortes and Evans Limited | Hospitality | 1970 |
| Fortes Bristol Limited | Hospitality | 2014 |
| Fortune Cookies 168 Ltd | Professional & scientific | 2016 |
| Forward Endeavours Limited | Professional & scientific | 2015 |
| Foss Street Dartmouth Ltd | Construction | 2021 |
| Foss Ventures Ltd | Wholesale & retail | 2024 |
| Fosse House Holdings Limited | Financial services | 2018 |
| Fotc Ltd | Hospitality | 2022 |
| Fotg Ltd | Wholesale & retail | 2022 |
| Found Festival CIC | Arts & recreation | 2025 |
| Founders Collection | Extraterritorial | 2017 |
| Foundry Hill Limited | Professional & scientific | 2026 |
| Four Points Property Limited | Real estate | 2021 |
| FOUR19 Fitness Limited | Arts & recreation | 2024 |
| Fourth Wall Design Limited | Professional & scientific | 2021 |
| Fowden Building Services Limited | Construction | 2002 |
| Fowden Property Investments Ltd | Real estate | 2025 |
| FOX & Friends Ltd | Professional & scientific | 2026 |